如何将2个UIImageView中的2个图像合并为1个图像

Question

我想将2个UIImageView中的2个图像合并为1个图像，并在屏幕上显示“正确”位置，角度，比例比例。

在我的项目中，有2的UIImageView - ImageView的是主要的UIImageView - topImageView是覆盖的UIImageView是可以拖动，旋转，缩放

我可以保存图像合并以得出2幅图像，但错了位置，角度，比例尺度。

这是我的代码：

UIImage *img = topImageView.image; 
UIImage *bottomImg = self.imageView.image; 
CGSize bounds = self.imageView.image.size; 

UIGraphicsBeginImageContext(bounds); 
CGContextRef ctx = UIGraphicsGetCurrentContext(); 
CGContextTranslateCTM(ctx, topImageView.image.size.width * 0.5, topImageView.image.size.height * 0.5); 
CGFloat angle = atan2(topImageView.transform.b, topImageView.transform.a); 
CGContextRotateCTM(ctx, angle); 

[topImageView.image drawInRect:CGRectMake(-topImageView.image.size.width * 0.5, 
              -topImageView.image.size.height * 0.5, 
              topImageView.image.size.width, 
              topImageView.image.size.height)]; 
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext(); 
UIGraphicsEndImageContext(); 

UIGraphicsBeginImageContext(bounds); 
[bottomImg drawInRect:CGRectMake(0, 0, bounds.width, bounds.height)]; 
[newImage drawInRect:CGRectMake(topImageView.frame.origin.x, 
           topImageView.frame.origin.y, 
           newImage.size.width, 
           newImage.size.height)]; 
UIImage *finalImage = UIGraphicsGetImageFromCurrentImageContext(); 
UIGraphicsEndImageContext(); 

任何想法帮助我吗？非常感谢！

Answer 1

将这两个图像作为子视图添加到UIView中。你需要的图片是什么，然后采取的UIView像这样的快照：

UIGraphicsBeginImageContext(view.bounds.size); 
[view.layer renderInContext:UIGraphicsGetCurrentContext()]; 
UIImage *MergedImage = UIGraphicsGetImageFromCurrentImageContext(); 
UIGraphicsEndImageContext(); 

Answer 2

尝试这个

#pragma mark - Marge two Images 

- (UIImage *) addImageToImage:(UIImage *)img withImage2:(UIImage *)img2{ 

    CGSize size = CGSizeMake(imageView.image.size.width, imageView.image.size.height); 
    UIGraphicsBeginImageContext(size); 

    CGPoint pointImg1 = CGPointMake(0,0); 
    [img drawAtPoint:pointImg1]; 

    CGPoint pointImg2 = CGPointMake(0,0); 
    [img2 drawAtPoint: pointImg2]; 

    UIImage* result = UIGraphicsGetImageFromCurrentImageContext(); 
    UIGraphicsEndImageContext(); 

    return result; 
} 


[self addImageToImage:imageView.image withImage2:imageView2.image];